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Use CursorBase utility functions to reduce repositioning clutter.

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This commit is contained in:
Dan Gohman
2017-09-20 06:58:45 -07:00
parent 144d39a53d
commit b888894fbb
5 changed files with 22 additions and 9 deletions
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19
lib/cretonne/src/ir/layout.rs
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@@ -788,10 +788,27 @@ pub trait CursorBase {
self.set_position(CursorPosition::At(inst));
}
/// Go to the position for inserting instructions at the beginning of `ebb`,
/// which unlike `goto_first_inst` doesn't assume that any instructions have
/// been inserted into `ebb` yet.
fn goto_first_insertion_point(&mut self, ebb: Ebb) {
if let Some(inst) = self.layout().ebbs[ebb].first_inst.expand() {
self.goto_inst(inst);
} else {
self.goto_bottom(ebb);
}
}
/// Go to the first instruction in `ebb`.
fn goto_first_inst(&mut self, ebb: Ebb) {
let inst = self.layout().ebbs[ebb].first_inst.expect("Empty EBB");
self.set_position(CursorPosition::At(inst));
self.goto_inst(inst);
}
/// Go to the last instruction in `ebb`.
fn goto_last_inst(&mut self, ebb: Ebb) {
let inst = self.layout().ebbs[ebb].last_inst.expect("Empty EBB");
self.goto_inst(inst);
}
/// Go to the top of `ebb` which must be inserted into the layout.